This typical exchange sac gives Black overwhelming compensation.
10. f3a3 The point of White's previous move. The knight is indirectly protected, thanks to the pin. Of course, Black always has the option of capturing the knight anyway and then playing to exploit his development advantage with the out-of-play white queen in the corner of the board. 10... f8e7 Time to finish development. 11. c1d2 Firouzja probably got his analysis mixed up. 11... e8g8  12. d2b4 This makes things even worse.